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Finding the Fourth Proportional to 2,139.09, 3,209.09 and 1,215.08

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Solution

The fourth proportional to 2,139.09, 3,209.09 and 1,215.08 is: 1,822.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.09 : 3,209.09 = 1,215.08 : x
  2. Step 2: Convert to fraction form
    2,139.09/3,209.09 = 1,215.08/x
  3. Step 3: Cross multiply
    2,139.09x = 3,209.09 × 1,215.08
  4. Step 4: Simplify right side
    2,139.09x = 3,899,278.96
  5. Step 5: Solve for x
    x = 3,899,278.96/2,139.09
  6. Step 6: Final answer
    x = 1,822.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.